Propeller blade



M." NIIMUN PROPELLER BLADE Film1 Nov. 1, 926

IN VEN TOR.

atented et. ltd..

MOSES C. NIKON, UF CHICAGO, XLILINUIS.

IPROPEJLJLER BLADE.

Application 'l`11ed November 1, 1926. Serial No. 145,571.

'd such other objects as may hereinafter appear,

and consistspreferably, in the construction herein described and illustrated, which may be varied without departing from the spirit of my invention:

il@ 1n the drawingsFigure 1 is a sideelevational view of a propeller blade embodying the principles of my invention, certain parts thereof being broken out to show the internal lconstruction; Figs. 2 and 3 are transverse seclid tional views on lines Q-Qand SW3 respectively of Fig. 1, and Fig. Il is a transverse sec tional view of a propeller blade .of slightly modified construction. j

Referring first to Figs. 1 to 3 of the draw-y ings it will be noted that the propeller blade therein shown is constructed Wholly of metal,

comprising a sheet of metal 5 which is bent or folded longitudinally and forms the edge 5a of the blade, the free edges 5b and 5 of said sheet being secured together, as will be presently described, to form the opposite edge 5d of the blade. A reinforcement 6, preferably in the form of a channel-like member, extends longitudinally within the blade from its butt end to the tip and has its flanges secured inv any preferred manner, as by rivets 7 to the opposite sides of the sheet 5. The reinforcement is inserted within the blade before the edges 5b and 5C are secured together, the edge 5b occupying a position, substantially as shown in dotted lines in Fig. 2. 'llhe edges '5b and 5 may be brought into di rect. contact with each other and riveted. or welded together but they are preferably disposed in i suitable grooves or recesses formed in an edge reinforcement member 8 and are secured to the member 8 in any desired manner, for example, by rivets 9. 'llhe blade may be constructed so that either edge may serve as the leading edge but the blade is preferably constructed so that the two edges 5b and 5 form the trailing edge of the blade thus presenting an integralunlorolren sheet of material at the leading edge of the blade.

The propeller blade may be fastened at its butt end to the driving mechanism in any pres tttt ferred manner, in the present case the butt of the blade being adapted to be mounted on apparatus suoli as is described in my parent application Serial No. 106,431.

rllhe blade construction shown in lFig. d is similar to that heretofore described except a plurality of channel-like bars 10 are employed for reinforcing the blades. llVhere a plurality of reinforcing members are employed they 5U may be relatively lighter in weight and placed in the blade so that their weight is distributed more uniformly throughout the blade thus affording an improved construction.

lln both constructions it will be noted. that mi channel-like members are employed and are disposed-sothat their flanges project toward the edges 5b and 5 of the enclosing sheet forming a blade. The disposition ofthe chanynel-like members in this manner is necessary l in order to rivet or otherwise secure their flanges to the sides of the blades.

While the preferred form of my invention, with one modification is shown, it is obvious that other modifications may be made without 75 departing from the spirit of my invention and ll do not, therefore, limit myself to the details of construction herein shown: 4

1.- A propeller blade comprising a sheet. of 8o metal, a channeldike member extending substantially the length of the blade. said sheet of metal being folded longitudinally so as to bring its sides against the flanges of said channel' member, said channel member being so 85 Vdisposed that its flanges project toward ithe 'interposed between the adjacent free edges of saidlsheet, and means for securing said free edgesof the sheet to said edge reinforcing l0@ member.,

MUSE t@ blltXlih 

